výtah z MSDN:

Constructors and Arrays
Arrays are constructed only using the default constructor. Default constructors are constructors that either accept no arguments or for which all arguments have a default. Arrays are always constructed in ascending order. The initialization for each member of the array is done using the same constructor.

na pole se volá jen defaultní konstruktor, bez parametrů nebo jen s default parametrama, takže to budeš muset nějak obejít, pokud to budeš potřebovat